Walker was transported to nearby St. Francis Hospital, where on Sunday he underwent three hours of surgery to stabilize his spine. Tulane team doctor Greg Stewart told ABC the procedure was "very successful.""[The paralysis potential] is certainly a concern," Stewart told the Tulsa World, "We don't know what the ultimate outcome is going to be."As with any severe spine injury, hours are long and dicey and reveal frustratingly little. It will be days or weeks before we'll know Walker's prognosis. He remains in stable condition in the ICU, with significant swelling around his spine. But late on Monday, Dickson shared a touching story on a Tulane conference call.